washine machine waste pipe

Yes, but it's on the input not the drain.

Yes but like already said, this will prevent back flow contamination in to wholesome water, so as far as air gap at waste is concerned, although a secondary protection in case of failure, is it a requirement?
 
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Obviously not, the water suppliers will be concerned about whether you contaminate their supply but not if you fill your drum full of crap & contaminate your washing because you didn't install the machine properly.
 

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